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制备出尺寸可控的空间网状金属多孔材料,对所制备的多孔材料进行组织分析。分析试样的微观结构,并讨论选区激光熔化多孔金属材料的成形机制及工艺参数对多孔结构特征的影响规律。结果表明:通过CAD制图确定扫描路径图,确定了骨架每根梁之间的扫描间距,决定了金属多孔材料的孔隙大小、孔隙形状及分布。制备出试件的每片薄壁、方孔分布均匀,孔隙大小统一且形状规则。骨架连接结点紧密,骨架的组织严密无开裂和弯曲现象。选区激光熔化制备空间网格状多孔材料骨架的形成机理分为颗粒表面局部熔化、形成金属熔池和粉末粘接三个阶段。
A size-controlled spatial network-like porous metal material was prepared, and the prepared porous material was subjected to tissue analysis. The microstructure of the sample was analyzed. The forming mechanism of the laser melted porous metal material and the influence of the process parameters on the porous structure were discussed. The results show that the scanning path map is determined by CAD drawing, the scanning distance between each beam of the skeleton is determined, and the pore size, pore shape and distribution of the porous metal material are determined. The thin wall of each specimen was prepared, the square holes were evenly distributed, the pore size was uniform and the shape was regular. Skeleton junction nodes close, the skeleton of the organization closely without cracking and bending phenomenon. The forming mechanism of space grid-like porous material skeleton for laser melting preparation in the constituency is divided into three stages: local melting of the particle surface, formation of metal pool and powder bonding.